CVE-2026-46331
net/sched: fix pedit partial COW leading to page cache corruption
- Published
- Jun 16, 2026
- Updated
- Sep 15, 2026
- Assigning CNA
- Linux
- Evidence observed
- Aug 6, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 46.3%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: fix pedit partial COW leading to page cache corruption tcf_pedit_act() computes the COW range for skb_ensure_writable() once before the key loop using tcfp_off_max_hint, but the hint does not account for the runtime header offset added by typed keys. This can leave part of the write region un-COW'd. Fix by moving skb_ensure_writable() inside the per-key loop where the actual write offset is known, and add overflow checking on the offset arithmetic. For negative offsets (e.g. Ethernet header edits at ingress), use skb_cow() to COW the headroom instead. Guard offset_valid() against INT_MIN, where negation is undefined.
Sources
12Pedit COW – Linux Kernel Local Privilege Escalation (CVE-2026-46331)
- CVE-2026-46331-pedit-COW-detectionDetection
Defensive validation of CVE-2026-46331 / pedit COW with auditd, AppArmor, mitigation comparison and detection logic.
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